java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-crafted/zero_sum4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:30:31,365 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:30:31,367 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:30:31,385 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-15 01:30:31,408 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:30:31,409 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:30:31,412 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:30:31,413 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:30:31,415 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:30:31,418 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:30:31,420 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:30:31,421 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:30:31,423 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:30:31,423 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:30:31,424 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:30:31,425 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:30:31,427 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:30:31,434 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:30:31,435 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:30:31,436 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:30:31,437 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 01:30:31,450 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:30:31,451 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:30:31,452 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:30:31,452 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:30:31,452 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:30:31,452 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:30:31,453 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:30:31,453 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:30:31,453 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:30:31,453 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:30:31,453 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:30:31,454 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:30:31,454 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:30:31,454 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:30:31,454 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:30:31,454 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:30:31,455 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:30:31,455 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:30:31,455 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:30:31,455 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:30:31,455 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:30:31,456 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:30:31,456 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:30:31,456 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:30:31,456 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:30:31,456 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:30:31,457 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:30:31,457 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:30:31,457 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 01:30:31,744 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:30:31,762 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:30:31,766 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:30:31,767 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:30:31,768 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:30:31,768 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum4.c [2019-10-15 01:30:31,842 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/620026dbd/ce22291229c84afca65ac164e5bd9126/FLAGef3c9bfda [2019-10-15 01:30:32,333 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:30:32,334 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum4.c [2019-10-15 01:30:32,340 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/620026dbd/ce22291229c84afca65ac164e5bd9126/FLAGef3c9bfda [2019-10-15 01:30:32,730 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/620026dbd/ce22291229c84afca65ac164e5bd9126 [2019-10-15 01:30:32,740 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:30:32,742 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:30:32,743 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:30:32,743 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:30:32,746 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:30:32,747 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:30:32" (1/1) ... [2019-10-15 01:30:32,750 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@189ba05e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:32, skipping insertion in model container [2019-10-15 01:30:32,750 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:30:32" (1/1) ... [2019-10-15 01:30:32,757 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:30:32,776 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:30:32,957 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:30:32,968 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:30:32,996 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:30:33,104 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:30:33,106 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:33 WrapperNode [2019-10-15 01:30:33,107 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:30:33,107 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:30:33,108 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:30:33,108 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:30:33,117 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:33" (1/1) ... [2019-10-15 01:30:33,118 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:33" (1/1) ... [2019-10-15 01:30:33,124 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:33" (1/1) ... [2019-10-15 01:30:33,124 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:33" (1/1) ... [2019-10-15 01:30:33,133 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:33" (1/1) ... [2019-10-15 01:30:33,140 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:33" (1/1) ... [2019-10-15 01:30:33,142 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:33" (1/1) ... [2019-10-15 01:30:33,145 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:30:33,145 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:30:33,145 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:30:33,145 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:30:33,146 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:33" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:30:33,202 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:30:33,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:30:33,203 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:30:33,203 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:30:33,203 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:30:33,203 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:30:33,203 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:30:33,204 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2019-10-15 01:30:33,204 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:30:33,204 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:30:33,204 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:30:33,204 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:30:33,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:30:33,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:30:33,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:30:33,703 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:30:33,703 INFO L284 CfgBuilder]: Removed 9 assume(true) statements. [2019-10-15 01:30:33,704 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:30:33 BoogieIcfgContainer [2019-10-15 01:30:33,705 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:30:33,706 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:30:33,706 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:30:33,709 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:30:33,709 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:30:32" (1/3) ... [2019-10-15 01:30:33,710 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@547ebd03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:30:33, skipping insertion in model container [2019-10-15 01:30:33,710 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:30:33" (2/3) ... [2019-10-15 01:30:33,710 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@547ebd03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:30:33, skipping insertion in model container [2019-10-15 01:30:33,711 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:30:33" (3/3) ... [2019-10-15 01:30:33,712 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum4.c [2019-10-15 01:30:33,720 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:30:33,726 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:30:33,738 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:30:33,768 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:30:33,768 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:30:33,768 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:30:33,768 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:30:33,768 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:30:33,769 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:30:33,769 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:30:33,769 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:30:33,783 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-15 01:30:33,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-15 01:30:33,789 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:33,789 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:33,791 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:33,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:33,796 INFO L82 PathProgramCache]: Analyzing trace with hash 936704280, now seen corresponding path program 1 times [2019-10-15 01:30:33,803 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:33,803 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541146454] [2019-10-15 01:30:33,804 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:33,804 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:33,804 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:33,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:34,007 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:30:34,008 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541146454] [2019-10-15 01:30:34,009 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:30:34,010 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:30:34,010 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695166906] [2019-10-15 01:30:34,015 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:30:34,015 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:34,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:30:34,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:30:34,033 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2019-10-15 01:30:34,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:34,153 INFO L93 Difference]: Finished difference Result 52 states and 71 transitions. [2019-10-15 01:30:34,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:30:34,155 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2019-10-15 01:30:34,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:34,165 INFO L225 Difference]: With dead ends: 52 [2019-10-15 01:30:34,165 INFO L226 Difference]: Without dead ends: 28 [2019-10-15 01:30:34,169 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:30:34,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-15 01:30:34,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-15 01:30:34,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-15 01:30:34,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 43 transitions. [2019-10-15 01:30:34,209 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 43 transitions. Word has length 19 [2019-10-15 01:30:34,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:34,210 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 43 transitions. [2019-10-15 01:30:34,210 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:30:34,210 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 43 transitions. [2019-10-15 01:30:34,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 01:30:34,211 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:34,212 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:34,212 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:34,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:34,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1654172677, now seen corresponding path program 1 times [2019-10-15 01:30:34,213 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:34,213 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173652495] [2019-10-15 01:30:34,213 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:34,214 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:34,214 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:34,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:34,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:30:34,283 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173652495] [2019-10-15 01:30:34,283 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:30:34,286 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:30:34,286 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783253471] [2019-10-15 01:30:34,288 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:30:34,288 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:34,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:30:34,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:30:34,289 INFO L87 Difference]: Start difference. First operand 28 states and 43 transitions. Second operand 3 states. [2019-10-15 01:30:34,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:34,341 INFO L93 Difference]: Finished difference Result 50 states and 80 transitions. [2019-10-15 01:30:34,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:30:34,342 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-10-15 01:30:34,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:34,343 INFO L225 Difference]: With dead ends: 50 [2019-10-15 01:30:34,343 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 01:30:34,344 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:30:34,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 01:30:34,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-15 01:30:34,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 01:30:34,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 44 transitions. [2019-10-15 01:30:34,352 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 44 transitions. Word has length 20 [2019-10-15 01:30:34,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:34,353 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 44 transitions. [2019-10-15 01:30:34,353 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:30:34,353 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 44 transitions. [2019-10-15 01:30:34,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:30:34,354 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:34,354 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:34,355 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:34,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:34,355 INFO L82 PathProgramCache]: Analyzing trace with hash 2052158869, now seen corresponding path program 1 times [2019-10-15 01:30:34,356 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:34,356 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952563169] [2019-10-15 01:30:34,356 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:34,356 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:34,356 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:34,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:34,434 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:30:34,435 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952563169] [2019-10-15 01:30:34,435 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:30:34,435 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:30:34,436 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156392420] [2019-10-15 01:30:34,437 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:30:34,437 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:34,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:30:34,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:30:34,438 INFO L87 Difference]: Start difference. First operand 29 states and 44 transitions. Second operand 4 states. [2019-10-15 01:30:34,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:34,544 INFO L93 Difference]: Finished difference Result 48 states and 76 transitions. [2019-10-15 01:30:34,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:30:34,546 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2019-10-15 01:30:34,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:34,547 INFO L225 Difference]: With dead ends: 48 [2019-10-15 01:30:34,547 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 01:30:34,548 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:30:34,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 01:30:34,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-15 01:30:34,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 01:30:34,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2019-10-15 01:30:34,562 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 21 [2019-10-15 01:30:34,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:34,564 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2019-10-15 01:30:34,564 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:30:34,565 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2019-10-15 01:30:34,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:30:34,567 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:34,567 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:34,567 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:34,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:34,568 INFO L82 PathProgramCache]: Analyzing trace with hash 1641054906, now seen corresponding path program 1 times [2019-10-15 01:30:34,568 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:34,569 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459817455] [2019-10-15 01:30:34,569 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:34,569 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:34,569 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:34,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:34,673 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:30:34,674 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459817455] [2019-10-15 01:30:34,675 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706520230] [2019-10-15 01:30:34,675 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:34,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:34,741 INFO L256 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:30:34,750 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:30:34,806 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:30:34,808 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:30:34,845 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:30:34,846 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1512831043] [2019-10-15 01:30:34,898 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:30:34,898 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:30:34,906 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:30:34,914 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:30:34,915 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:30:35,068 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:30:35,608 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:30:35,628 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:30:35,637 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:30:35,993 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:30:35,993 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-10-15 01:30:35,993 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720453134] [2019-10-15 01:30:35,995 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-15 01:30:35,995 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:35,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-15 01:30:35,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2019-10-15 01:30:35,996 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand 17 states. [2019-10-15 01:30:36,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:36,379 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2019-10-15 01:30:36,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-15 01:30:36,380 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 28 [2019-10-15 01:30:36,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:36,381 INFO L225 Difference]: With dead ends: 51 [2019-10-15 01:30:36,381 INFO L226 Difference]: Without dead ends: 30 [2019-10-15 01:30:36,382 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2019-10-15 01:30:36,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-15 01:30:36,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-10-15 01:30:36,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-15 01:30:36,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2019-10-15 01:30:36,393 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 28 [2019-10-15 01:30:36,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:36,393 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2019-10-15 01:30:36,394 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-15 01:30:36,394 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2019-10-15 01:30:36,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-15 01:30:36,397 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:36,397 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:36,598 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:36,599 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:36,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:36,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1664007242, now seen corresponding path program 2 times [2019-10-15 01:30:36,599 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:36,599 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958746221] [2019-10-15 01:30:36,600 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:36,600 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:36,600 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:36,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:36,682 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:30:36,682 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958746221] [2019-10-15 01:30:36,682 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094536896] [2019-10-15 01:30:36,683 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:36,751 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:30:36,752 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:30:36,753 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:30:36,755 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:30:36,787 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:30:36,787 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:30:36,814 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:30:36,815 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667001630] [2019-10-15 01:30:36,817 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:30:36,817 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:30:36,818 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:30:36,818 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:30:36,820 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:30:36,870 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:30:37,320 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:30:37,338 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:30:37,344 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:30:37,663 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:30:37,664 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 18 [2019-10-15 01:30:37,664 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411795163] [2019-10-15 01:30:37,665 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:30:37,665 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:37,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:30:37,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:30:37,666 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand 18 states. [2019-10-15 01:30:38,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:38,046 INFO L93 Difference]: Finished difference Result 57 states and 79 transitions. [2019-10-15 01:30:38,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-15 01:30:38,046 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 29 [2019-10-15 01:30:38,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:38,047 INFO L225 Difference]: With dead ends: 57 [2019-10-15 01:30:38,047 INFO L226 Difference]: Without dead ends: 38 [2019-10-15 01:30:38,048 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 72 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2019-10-15 01:30:38,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-15 01:30:38,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-10-15 01:30:38,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-10-15 01:30:38,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2019-10-15 01:30:38,056 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 29 [2019-10-15 01:30:38,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:38,056 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2019-10-15 01:30:38,056 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:30:38,056 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2019-10-15 01:30:38,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-15 01:30:38,057 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:38,057 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:38,266 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:38,267 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:38,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:38,267 INFO L82 PathProgramCache]: Analyzing trace with hash 939463896, now seen corresponding path program 3 times [2019-10-15 01:30:38,268 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:38,268 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162173531] [2019-10-15 01:30:38,269 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:38,269 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:38,269 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:38,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:38,956 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:30:38,956 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162173531] [2019-10-15 01:30:38,956 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963545654] [2019-10-15 01:30:38,956 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:39,110 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:30:39,111 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:30:39,114 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 74 conjunts are in the unsatisfiable core [2019-10-15 01:30:39,118 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:30:39,413 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:30:39,413 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:30:39,704 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:30:39,704 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [802327662] [2019-10-15 01:30:39,706 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:30:39,707 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:30:39,707 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:30:39,707 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:30:39,707 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:30:39,732 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:30:39,978 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:30:39,995 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:30:39,999 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:30:40,555 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:30:40,555 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11, 11] total 33 [2019-10-15 01:30:40,555 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2288223] [2019-10-15 01:30:40,556 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-15 01:30:40,557 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:40,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-15 01:30:40,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=956, Unknown=0, NotChecked=0, Total=1056 [2019-10-15 01:30:40,558 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 33 states. [2019-10-15 01:30:41,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:41,634 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2019-10-15 01:30:41,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-15 01:30:41,635 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 37 [2019-10-15 01:30:41,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:41,636 INFO L225 Difference]: With dead ends: 65 [2019-10-15 01:30:41,636 INFO L226 Difference]: Without dead ends: 60 [2019-10-15 01:30:41,637 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 89 SyntacticMatches, 21 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=163, Invalid=1559, Unknown=0, NotChecked=0, Total=1722 [2019-10-15 01:30:41,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-15 01:30:41,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2019-10-15 01:30:41,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-15 01:30:41,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 73 transitions. [2019-10-15 01:30:41,647 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 73 transitions. Word has length 37 [2019-10-15 01:30:41,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:41,647 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 73 transitions. [2019-10-15 01:30:41,647 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-15 01:30:41,647 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 73 transitions. [2019-10-15 01:30:41,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-15 01:30:41,649 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:41,649 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:41,852 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:41,853 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:41,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:41,853 INFO L82 PathProgramCache]: Analyzing trace with hash -944115259, now seen corresponding path program 4 times [2019-10-15 01:30:41,853 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:41,853 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984198156] [2019-10-15 01:30:41,853 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:41,854 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:41,854 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:41,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:41,907 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:30:41,908 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984198156] [2019-10-15 01:30:41,908 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413867434] [2019-10-15 01:30:41,908 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:42,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:42,004 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:30:42,007 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:30:42,066 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:30:42,066 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:30:42,101 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 01:30:42,101 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1863472046] [2019-10-15 01:30:42,103 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:30:42,103 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:30:42,104 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:30:42,104 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:30:42,104 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:30:42,128 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:30:42,353 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:30:42,361 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:30:42,364 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:30:42,726 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:30:42,727 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 23 [2019-10-15 01:30:42,727 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483666596] [2019-10-15 01:30:42,728 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-15 01:30:42,728 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:42,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-15 01:30:42,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2019-10-15 01:30:42,730 INFO L87 Difference]: Start difference. First operand 58 states and 73 transitions. Second operand 23 states. [2019-10-15 01:30:43,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:43,228 INFO L93 Difference]: Finished difference Result 110 states and 140 transitions. [2019-10-15 01:30:43,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-15 01:30:43,228 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 38 [2019-10-15 01:30:43,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:43,229 INFO L225 Difference]: With dead ends: 110 [2019-10-15 01:30:43,229 INFO L226 Difference]: Without dead ends: 59 [2019-10-15 01:30:43,231 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 96 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=131, Invalid=739, Unknown=0, NotChecked=0, Total=870 [2019-10-15 01:30:43,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-15 01:30:43,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2019-10-15 01:30:43,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-10-15 01:30:43,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 74 transitions. [2019-10-15 01:30:43,240 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 74 transitions. Word has length 38 [2019-10-15 01:30:43,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:43,240 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 74 transitions. [2019-10-15 01:30:43,240 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-15 01:30:43,241 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 74 transitions. [2019-10-15 01:30:43,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-15 01:30:43,242 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:43,242 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:43,445 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:43,447 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:43,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:43,448 INFO L82 PathProgramCache]: Analyzing trace with hash -670468267, now seen corresponding path program 5 times [2019-10-15 01:30:43,448 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:43,448 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806588117] [2019-10-15 01:30:43,448 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:43,449 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:43,449 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:43,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:43,525 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:30:43,525 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806588117] [2019-10-15 01:30:43,525 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147917925] [2019-10-15 01:30:43,526 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:43,665 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:30:43,665 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:30:43,666 INFO L256 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:30:43,670 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:30:43,712 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:30:43,712 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:30:43,755 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:30:43,756 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [634532240] [2019-10-15 01:30:43,757 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:30:43,757 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:30:43,758 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:30:43,758 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:30:43,758 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:30:43,778 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-10-15 01:30:43,990 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:30:44,001 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:30:44,004 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:30:44,323 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:30:44,323 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 24 [2019-10-15 01:30:44,323 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875691643] [2019-10-15 01:30:44,324 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 01:30:44,324 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:44,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 01:30:44,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:30:44,326 INFO L87 Difference]: Start difference. First operand 59 states and 74 transitions. Second operand 24 states. [2019-10-15 01:30:44,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:44,864 INFO L93 Difference]: Finished difference Result 90 states and 118 transitions. [2019-10-15 01:30:44,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-15 01:30:44,865 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 39 [2019-10-15 01:30:44,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:44,866 INFO L225 Difference]: With dead ends: 90 [2019-10-15 01:30:44,866 INFO L226 Difference]: Without dead ends: 47 [2019-10-15 01:30:44,868 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 97 SyntacticMatches, 6 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 317 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=175, Invalid=947, Unknown=0, NotChecked=0, Total=1122 [2019-10-15 01:30:44,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-15 01:30:44,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-10-15 01:30:44,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-15 01:30:44,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2019-10-15 01:30:44,875 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 39 [2019-10-15 01:30:44,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:44,875 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2019-10-15 01:30:44,876 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 01:30:44,876 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2019-10-15 01:30:44,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-15 01:30:44,877 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:44,877 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:45,078 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:45,079 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:45,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:45,081 INFO L82 PathProgramCache]: Analyzing trace with hash 546226426, now seen corresponding path program 6 times [2019-10-15 01:30:45,081 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:45,081 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100788974] [2019-10-15 01:30:45,081 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:45,082 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:45,082 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:45,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:45,750 WARN L191 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 38 [2019-10-15 01:30:45,901 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 35 [2019-10-15 01:30:46,056 WARN L191 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 32 [2019-10-15 01:30:46,212 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 29 [2019-10-15 01:30:46,355 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 36 [2019-10-15 01:30:47,595 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:30:47,596 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100788974] [2019-10-15 01:30:47,596 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [513629543] [2019-10-15 01:30:47,596 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:47,714 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:30:47,714 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:30:47,716 WARN L254 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 106 conjunts are in the unsatisfiable core [2019-10-15 01:30:47,720 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:30:48,211 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:30:48,211 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:30:48,836 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 29 [2019-10-15 01:30:48,915 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:30:48,915 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [208580754] [2019-10-15 01:30:48,920 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:30:48,920 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:30:48,921 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:30:48,921 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:30:48,922 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:30:48,942 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:30:49,157 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:30:49,171 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:30:49,175 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:30:49,897 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:30:49,897 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 13, 13, 11] total 53 [2019-10-15 01:30:49,898 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534964464] [2019-10-15 01:30:49,898 INFO L442 AbstractCegarLoop]: Interpolant automaton has 53 states [2019-10-15 01:30:49,899 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:49,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2019-10-15 01:30:49,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=2553, Unknown=0, NotChecked=0, Total=2756 [2019-10-15 01:30:49,901 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 53 states. [2019-10-15 01:30:52,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:52,382 INFO L93 Difference]: Finished difference Result 81 states and 96 transitions. [2019-10-15 01:30:52,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-15 01:30:52,383 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 46 [2019-10-15 01:30:52,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:52,385 INFO L225 Difference]: With dead ends: 81 [2019-10-15 01:30:52,385 INFO L226 Difference]: Without dead ends: 76 [2019-10-15 01:30:52,388 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 101 SyntacticMatches, 26 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1749 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=416, Invalid=4554, Unknown=0, NotChecked=0, Total=4970 [2019-10-15 01:30:52,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-10-15 01:30:52,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2019-10-15 01:30:52,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-15 01:30:52,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2019-10-15 01:30:52,398 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 46 [2019-10-15 01:30:52,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:52,398 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2019-10-15 01:30:52,398 INFO L463 AbstractCegarLoop]: Interpolant automaton has 53 states. [2019-10-15 01:30:52,398 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2019-10-15 01:30:52,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-15 01:30:52,399 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:52,399 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:52,610 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:52,611 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:52,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:52,611 INFO L82 PathProgramCache]: Analyzing trace with hash 2058829319, now seen corresponding path program 7 times [2019-10-15 01:30:52,612 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:52,612 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153089848] [2019-10-15 01:30:52,612 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:52,612 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:52,612 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:52,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:52,696 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:30:52,696 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153089848] [2019-10-15 01:30:52,696 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382365180] [2019-10-15 01:30:52,697 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:52,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:52,847 INFO L256 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:30:52,854 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:30:52,919 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:30:52,920 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:30:52,968 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-15 01:30:52,968 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1736060590] [2019-10-15 01:30:52,970 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:30:52,970 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:30:52,970 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:30:52,971 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:30:52,971 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:30:52,999 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:30:53,200 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:30:53,216 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:30:53,223 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:30:53,573 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:30:53,573 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 11] total 26 [2019-10-15 01:30:53,573 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35694257] [2019-10-15 01:30:53,574 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-15 01:30:53,575 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:53,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-15 01:30:53,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2019-10-15 01:30:53,576 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand 26 states. [2019-10-15 01:30:54,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:54,206 INFO L93 Difference]: Finished difference Result 140 states and 170 transitions. [2019-10-15 01:30:54,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-15 01:30:54,206 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 47 [2019-10-15 01:30:54,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:54,208 INFO L225 Difference]: With dead ends: 140 [2019-10-15 01:30:54,208 INFO L226 Difference]: Without dead ends: 74 [2019-10-15 01:30:54,210 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 120 SyntacticMatches, 6 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=955, Unknown=0, NotChecked=0, Total=1122 [2019-10-15 01:30:54,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-15 01:30:54,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2019-10-15 01:30:54,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-10-15 01:30:54,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 89 transitions. [2019-10-15 01:30:54,219 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 89 transitions. Word has length 47 [2019-10-15 01:30:54,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:54,219 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 89 transitions. [2019-10-15 01:30:54,219 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-15 01:30:54,219 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 89 transitions. [2019-10-15 01:30:54,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-15 01:30:54,220 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:54,220 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:54,431 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:54,431 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:54,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:54,432 INFO L82 PathProgramCache]: Analyzing trace with hash -463668617, now seen corresponding path program 8 times [2019-10-15 01:30:54,432 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:54,432 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524761254] [2019-10-15 01:30:54,432 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:54,432 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:54,432 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:54,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:54,522 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-15 01:30:54,522 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524761254] [2019-10-15 01:30:54,522 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600092271] [2019-10-15 01:30:54,522 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:54,677 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:30:54,677 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:30:54,678 INFO L256 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:30:54,680 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:30:54,748 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-15 01:30:54,748 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:30:54,806 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-10-15 01:30:54,807 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1777959746] [2019-10-15 01:30:54,808 INFO L162 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-10-15 01:30:54,809 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:30:54,809 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:30:54,809 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:30:54,809 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:30:54,833 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 01:30:55,011 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 01:30:55,019 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:30:55,024 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:30:55,357 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:30:55,357 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 27 [2019-10-15 01:30:55,357 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060654118] [2019-10-15 01:30:55,358 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-15 01:30:55,359 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:30:55,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-15 01:30:55,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2019-10-15 01:30:55,360 INFO L87 Difference]: Start difference. First operand 74 states and 89 transitions. Second operand 27 states. [2019-10-15 01:30:56,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:30:56,037 INFO L93 Difference]: Finished difference Result 111 states and 139 transitions. [2019-10-15 01:30:56,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-15 01:30:56,038 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 48 [2019-10-15 01:30:56,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:30:56,039 INFO L225 Difference]: With dead ends: 111 [2019-10-15 01:30:56,039 INFO L226 Difference]: Without dead ends: 56 [2019-10-15 01:30:56,040 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 121 SyntacticMatches, 8 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=224, Invalid=1182, Unknown=0, NotChecked=0, Total=1406 [2019-10-15 01:30:56,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-10-15 01:30:56,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-10-15 01:30:56,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-15 01:30:56,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 64 transitions. [2019-10-15 01:30:56,048 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 64 transitions. Word has length 48 [2019-10-15 01:30:56,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:30:56,048 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 64 transitions. [2019-10-15 01:30:56,048 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-15 01:30:56,048 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 64 transitions. [2019-10-15 01:30:56,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-15 01:30:56,049 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:30:56,049 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:30:56,256 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:30:56,257 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:30:56,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:30:56,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1490739352, now seen corresponding path program 9 times [2019-10-15 01:30:56,258 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:30:56,258 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828095294] [2019-10-15 01:30:56,258 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:56,258 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:30:56,259 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:30:56,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:30:57,044 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 14 [2019-10-15 01:30:57,260 WARN L191 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 26 [2019-10-15 01:30:57,470 WARN L191 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 34 [2019-10-15 01:30:57,701 WARN L191 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 38 [2019-10-15 01:30:57,954 WARN L191 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 35 [2019-10-15 01:30:58,157 WARN L191 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 34 [2019-10-15 01:30:58,365 WARN L191 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 37 [2019-10-15 01:30:58,563 WARN L191 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 36 [2019-10-15 01:30:58,759 WARN L191 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 28 [2019-10-15 01:30:58,920 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 19 [2019-10-15 01:30:59,086 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 26 [2019-10-15 01:30:59,323 WARN L191 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 36 [2019-10-15 01:30:59,541 WARN L191 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 39 [2019-10-15 01:30:59,752 WARN L191 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 38 [2019-10-15 01:30:59,971 WARN L191 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 35 [2019-10-15 01:31:00,178 WARN L191 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 37 [2019-10-15 01:31:00,354 WARN L191 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 34 [2019-10-15 01:31:00,503 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 25 [2019-10-15 01:31:00,650 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 19 [2019-10-15 01:31:00,973 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 37 [2019-10-15 01:31:02,043 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 1 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:02,044 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828095294] [2019-10-15 01:31:02,044 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152351035] [2019-10-15 01:31:02,044 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:02,210 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:31:02,210 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:02,214 WARN L254 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 138 conjunts are in the unsatisfiable core [2019-10-15 01:31:02,217 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:03,018 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:31:03,019 INFO L321 TraceCheckSpWp]: Computing backward predicates...